What are common 'diff' command options?

Here are some common options for the diff command:

1. -u: Unified format; shows a few lines of context around the differences.
2. -c: Context format; provides more context than the unified format.
3. -i: Ignores case differences in the comparison.
4. -w: Ignores all white space when comparing lines.
5. -r: Recursively compares any subdirectories found.
6. -q: Reports only whether the files differ, not the details of the differences.
7. -N: Treats absent files as empty when comparing.

You can combine these options as needed. For example, diff -u -r dir1 dir2 will recursively compare two directories and show differences in a unified format. If you need more details on a specific option, let me know!